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Tuesday, July 17, 2007

Lies And More Lies

Richard is a strange liar. He lies on six days of the week, but on the seventh day he always tells the truth. He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it's Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

The Question: On which day does Richard tell the truth?
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4 comments:

  1. Abe7/17/2007 10:28 AM

    Well, we know that the truth day cannot be Thursday, Saturday, or Sunday, because then all other days (including all days mentioned on day 1 and day 3) would be lying days, making his first and third statements true, but we know two out of three have to be lies.

    So the truth day has to be Monday, Tuesday, Wednesday, or Friday. Tuesday is the only one that works. Day 1 is Sunday.

    ReplyDelete
  2. Mr. Don7/17/2007 10:52 AM

    Very well stated, Abe.

    ReplyDelete
  3. Andy7/17/2007 10:54 AM

    Excellent analysis, Professor Don

    ReplyDelete
  4. Abe7/17/2007 11:46 AM

    Splendid comment, Andy.

    ReplyDelete

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